 /*******************************************************************************
  * Copyright (c) 2004, 2006 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.core.internal.runtime;

 import java.io.*;
 import java.net.URL ;
 import org.eclipse.core.internal.boot.PlatformURLConnection;
 import org.eclipse.core.internal.boot.PlatformURLHandler;
 import org.eclipse.core.runtime.IPath;
 import org.eclipse.osgi.util.NLS;
 import org.osgi.framework.Bundle;

 public class PlatformURLMetaConnection extends PlatformURLConnection {
     private Bundle target = null;
     private static boolean isRegistered = false;
     public static final String META = "meta"; //$NON-NLS-1$

     /*
      * Constructor for the class.
      */
     public PlatformURLMetaConnection(URL url) {
         super(url);
     }

     /* (non-Javadoc)
      * @see org.eclipse.equinox.internal.url.PlatformURLConnection#resolve()
      */
     protected URL resolve() throws IOException {
         String spec = url.getFile().trim();
         if (spec.startsWith("/")) //$NON-NLS-1$
 spec = spec.substring(1);
         if (!spec.startsWith(META))
             throw new IOException(NLS.bind(CommonMessages.url_badVariant, url.toString()));
         int ix = spec.indexOf("/", META.length() + 1); //$NON-NLS-1$
 String ref = ix == -1 ? spec.substring(META.length() + 1) : spec.substring(META.length() + 1, ix);
         String id = getId(ref);
         Activator activator = Activator.getDefault();
         if (activator == null)
             throw new IOException(CommonMessages.activator_not_available);
         target = activator.getBundle(id);
         if (target == null)
             throw new IOException(NLS.bind(CommonMessages.url_resolvePlugin, url.toString()));
         IPath path = MetaDataKeeper.getMetaArea().getStateLocation(target);
         if (ix != -1 || (ix + 1) <= spec.length())
             path = path.append(spec.substring(ix + 1));
         return path.toFile().toURL();
     }

     public static void startup() {
         // register connection type for platform:/meta handling
 if (isRegistered)
             return;
         PlatformURLHandler.register(META, PlatformURLMetaConnection.class);
         isRegistered = true;
     }

     /* (non-Javadoc)
      * @see java.net.URLConnection#getOutputStream()
      */
     public OutputStream getOutputStream() throws IOException {
         //This is not optimal but connection is a private instance variable in super.
 URL resolved = getResolvedURL();
         if (resolved != null) {
             String fileString = resolved.getFile();
             if (fileString != null) {
                 File file = new File(fileString);
                 String parent = file.getParent();
                 if (parent != null)
                     new File(parent).mkdirs();
                 return new FileOutputStream(file);
             }
         }
         return null;
     }
 }

